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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkXMLPStructuredDataWriter.h"
#include "vtkCommunicator.h"
#include "vtkDataSet.h"
#include "vtkErrorCode.h"
#include "vtkExecutive.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMultiProcessController.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkXMLStructuredDataWriter.h"
//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
vtkXMLPStructuredDataWriter::vtkXMLPStructuredDataWriter() = default;
//------------------------------------------------------------------------------
vtkXMLPStructuredDataWriter::~vtkXMLPStructuredDataWriter() = default;
//------------------------------------------------------------------------------
void vtkXMLPStructuredDataWriter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
//------------------------------------------------------------------------------
int vtkXMLPStructuredDataWriter::WriteInternal()
{
int retVal = this->Superclass::WriteInternal();
if (retVal == 0 || !this->GetContinuingExecution())
{
this->Extents.clear();
}
return retVal;
}
//------------------------------------------------------------------------------
void vtkXMLPStructuredDataWriter::WritePrimaryElementAttributes(ostream& os, vtkIndent indent)
{
int* wExt =
this->GetInputInformation(0, 0)->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());
this->WriteVectorAttribute("WholeExtent", 6, wExt);
this->Superclass::WritePrimaryElementAttributes(os, indent);
}
//------------------------------------------------------------------------------
void vtkXMLPStructuredDataWriter::WritePPieceAttributes(int index)
{
if (this->Extents.find(index) != this->Extents.end())
{
this->WriteVectorAttribute("Extent", 6, this->Extents[index].data());
if (this->ErrorCode == vtkErrorCode::OutOfDiskSpaceError)
{
return;
}
}
this->Superclass::WritePPieceAttributes(index);
}
//------------------------------------------------------------------------------
vtkXMLWriter* vtkXMLPStructuredDataWriter::CreatePieceWriter(int index)
{
vtkXMLStructuredDataWriter* pWriter = this->CreateStructuredPieceWriter();
pWriter->SetNumberOfPieces(this->NumberOfPieces);
pWriter->SetWritePiece(index);
pWriter->SetGhostLevel(this->GhostLevel);
return pWriter;
}
//------------------------------------------------------------------------------
void vtkXMLPStructuredDataWriter::PrepareSummaryFile()
{
this->Superclass::PrepareSummaryFile();
// The code below gathers extens from all processes to write in the
// meta-file. Note that the extent of each piece was already stored by
// each writer in WritePiece(). This is gathering it all to root node.
if (this->Controller)
{
// Even though the logic is pretty straightforward, we need to
// do a fair amount of work to use GatherV. Each rank simply
// serializes its extents to 7 int blocks - piece number and 6
// extent values. Then we gather this all to root.
int rank = this->Controller->GetLocalProcessId();
int nRanks = this->Controller->GetNumberOfProcesses();
int nPiecesTotal = 0;
vtkIdType nPieces = static_cast<vtkIdType>(this->Extents.size());
std::vector<vtkIdType> offsets(nRanks);
std::vector<vtkIdType> nPiecesAll(nRanks);
std::vector<vtkIdType> recvLengths(nRanks);
this->Controller->AllGather(&nPieces, nPiecesAll.data(), 1);
for (int i = 0; i < nRanks; i++)
{
offsets[i] = nPiecesTotal * 7;
nPiecesTotal += nPiecesAll[i];
recvLengths[i] = nPiecesAll[i] * 7;
}
std::vector<int> sendBuffer;
int sendSize = nPieces * 7;
if (nPieces > 0)
{
sendBuffer.resize(sendSize);
ExtentsType::iterator iter = this->Extents.begin();
for (int count = 0; iter != this->Extents.end(); ++iter, ++count)
{
sendBuffer[count * 7] = iter->first;
memcpy(&sendBuffer[count * 7 + 1], iter->second.data(), 6 * sizeof(int));
}
}
std::vector<int> recvBuffer;
if (rank == 0)
{
recvBuffer.resize(nPiecesTotal * 7);
}
this->Controller->GatherV(
sendBuffer.data(), recvBuffer.data(), sendSize, recvLengths.data(), offsets.data(), 0);
if (rank == 0)
{
// Add all received values to Extents.
// These are later written in WritePPieceAttributes()
for (int i = 1; i < nRanks; i++)
{
for (int j = 0; j < nPiecesAll[i]; j++)
{
int* buffer = recvBuffer.data() + offsets[i] + j * 7;
this->Extents[*buffer] = std::vector<int>(buffer + 1, buffer + 7);
}
}
}
}
}
//------------------------------------------------------------------------------
int vtkXMLPStructuredDataWriter::WritePiece(int index)
{
int result = this->Superclass::WritePiece(index);
if (result)
{
// Store the extent of this piece in Extents. This is later used
// in WritePPieceAttributes to write the summary file.
vtkDataSet* input = this->GetDataSetInput();
int* ext = input->GetInformation()->Get(vtkDataObject::DATA_EXTENT());
this->Extents[index] = std::vector<int>(ext, ext + 6);
}
return result;
}
VTK_ABI_NAMESPACE_END
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